The angle of elevation of the top of a t...

The angle of elevation of the top of a tower , vertically erected in the middle of a paddy field ,from two points on a horizontal line through the foot of the tower are given to be `alphaandbeta(alphagtbeta)` .The height of the tower is h unit .A possible distance (in the same unit between the points is

`(h(cot beta-cot alpha))/(cos (alpha-beta))`

`h(cot alpha -cot beta )`

`(h(tan beta-tan alpha))/(tan alpha tan beta)`

`h(cot alpha+cot beta )`

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